Khloe Kardashian filed for
divorce from Lamar Odom on Friday (Dec. 13), but according to new reports she's already moved on with another pro athlete --
Rihanna's ex, Los Angeles Dodgers outfielder
Matt Kemp.

According to
RadarOnline, the
"Keeping Up With the Kardashians" star and Kemp have been spending time together for months. Their relationship didn't become public knowledge until recently, when they were spotted together at multiple concerts in Los Angeles, including Drake, John Legend and Jay Z, throughout late November and early December.